Who Is Behind Foul Play on Flight MH370?

If deliberate action caused the disappearance of Malaysia Airlines Flight 370, who on board may be responsible? WSJ's Linda Freund reports.

This transcript has been automatically generated and may not be 100% accurate.

I ... I ... only this time mysterious a deliberate action to customize Chief disappearance of Malaysia Airlines flight three seventy ... he is ... we ... action ... someone ... if this was the court needed effort by one or more people aboard to change the plane's courts and ask its location ... and who may be responsible ... the FBI has looked into the backgrounds of the passengers and pilots ... but hasn't found any ties to terrorists grips a US official says ... two passengers identified as Iranian did board flight three seventy was stolen passports but long Forstmann officials say they are unlikely to have militant links ... why nineteen year-old was said to be seeking asylum in Germany ... his mother alert and Malaysian authorities undersigned didn't show up in Frankfurt ... a second and may have been trying to enter Europe with the stolen Italian passport and are full sense ... that he also has no known terror attacks ... his final destination Copenhagen according to electronic inventories viewed by WSJ ... the flights fifty two year old captain some Hari Ackman shock John Malaysia Airlines in nineteen eighty one ... colleagues call him calm Silvio and an aviation key ... in this YouTube video he says before appalling triple seven flight simulator ... they can help with computer parts ... Hari and co pilot for e Castleton meet up about twenty one thousand hours of flying experience between them ... Malaysian investigators haven't found any evidence linking the pilots to the disappearance ... that they are under increased scrutiny amid news that two vital communication systems were disabled on the fly ... to do so would require technical knowledge of the aircraft's internal structure and systems experts say ... the Malaysian aircraft engineer who credit cuts its expertise is also on the passenger manifest ... that there's no evidence linking him any foul play ... a possible motive for such a disconnection remains unclear ... Malaysia Airlines confirmed Saturday that flight three seventy wasn't carrying any valuable cargo ...